Show error message when start and finish date is invalid

bookwyrm/templates/readthrough/readthrough.html

@@ -0,0 +1,15 @@
+{% extends 'layout.html' %}
+{% load i18n %}
+{% load utilities %}
+
+{% block title %}
+{% blocktrans trimmed with title=book|book_title %}
+Add read dates for "<em>{{ title }}</em>"
+{% endblocktrans %}
+{% endblock %}
+
+{% block content %}
+
+{% include "readthrough/add_readthrough_modal.html" with book=book active=True static=True %}
+
+{% endblock %}